Crank-shaft



(No Modl.)

M.A'.GRBEN.

GRANK SHAFT.

Patented Nov. 25,

MMVI@ Arm/mns' UNITED STATES PATENT OFFICE.

MARTIN ASBURY GREEN, OF ALTOONA, PENNSYLVANIA.

CRANK- SHAFT.

4SPECIFICATION forming part o f Letters Patent No. 441,551, dated November 25, 1890.

Application tiled July 3 1, l 8 90.

To all whom t may concern:

Be it known that I, MARTIN AsBUEY GREEN, of Altoona, in the county of Blair and State of Pennsylvania, have invented new and useful Improvements in Crank-Shafts, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which- Figure 1 is a side elevation of a crank-shaft sultable for the application of my improvenl ent. Fig. 2 is an end view of the shaft. Fig. 3 is a side elevation of one of the convex blocks applied to the crank-shaft.. Fig. 4 is an edge view of the same. Fig. 5 is a side elevation of acrank, showin gtheconvexblocks In position. Fig. G is a side elevation of onehalf of the crank, showing one of the blocks In place. Fig. 7 shows the eccentrically-bored disk in its position on the crank; and Fig. 8 Is an edge View of the crank and disk, showing the latter in section.

Similar letters of reference indicate corresponding parts in all the views.

The object of Iny invention is to provide for the crank-shafts of center-crank engines a counter-balance which may be applied to the common center crank so as to be practically as solidas if formed integrally with the crank and the shaft.

My invention consists in the combination, with a center crank formed ot' two arms attached to or formed integrally with the shaft and acrank-pin connecting the arms, of con- Vex blocks secured to opposite sides of the crank-arms and turned oft, and disks fitted to the crank-arms and the blocks and shrunk on, the disks being eccentric to the crank-arm and blocks, but concentric with the crankshaft, each of the said disks being chambered on the crank side and provided with a counter-balance on the opposite side, all as hereinafter more fully described.

The crank-shaft A, to which my improvement is applied, consists of a shaft a, the arms b, and crank-pins c, formed integrally of one piece of Inetal. The sides of the arms l) are Serial No. 360,512. (No model.)

plain, and at the opposite end of each arm and upon opposite sides thereof are formedl tap-holes CZ for receiving the screw-rivets e, by means of which the convex blocks B are secured to the said arms Z9, these screw-rivets being designed merely for holding the conveX blocks B in place when they are turned ott' together with the crank. The blocks B, which are made of cast-iron or other suitable material,are chambered to reduce their Weight. To the crank-arms thus provided with the convex blocks are iitted the circular disks C, which are provided with eccentric apertures f for receiving the cranks and the convex blocks B, the said disks being bored so as to form a shrink fit on the crank and the convex blocks. The disks C upon, the sides opposite the crank are provided with counterbalance-weights D, formed integrally with the disks, and the remaining portions of the disks are chambered to reduce their weight. After the disks are shrunk on they are further secured by the blind-screw g, inserted between one of the blocksB and the inner edge of the disk. The center `crank thus counterbalanced is adapted for use in high-speed engines and.

MARTIN ASBURY GREEN.

Witnesses:

CHAs. W. KNIGHT, W. D. CoUcn. 

